//  基本数据类型之间的转换之Number
 //number
 //0
 console.log(Number())
 //NaN  undefined 数值上下文中没有转成一个特定数字的含义
 console.log(Number(undefined))
 // 0
 console.log(Number(null))
 console.log(Number(false))
 console.log(Number(ture))
 console.log(Number('123'))
 console.log(Number("-123"))
 // 16进制
 console.log(Number("0x11"))
 console.log(Number(""),Number(" "))
 console.log(Number("100a"))
 

 
 


 